proxmox-mirrors/mirror_frr
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_frr synced 2025-11-03 23:47:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
d114b977e9
mirror_frr/bgpd/bgp_evpn.c
Renato Westphal b3c18264e4 Merge pull request #1079 from qlyoung/fix-style-a 
*: fix style
2017-08-31 13:22:55 -03:00

2933 lines
76 KiB
C
Raw Blame History

/* Ethernet-VPN Packet and vty Processing File
* Copyright (C) 2016 6WIND
* Copyright (C) 2017 Cumulus Networks, Inc.
*
* This file is part of FRR.
*
* FRRouting is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* FRRouting is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include "command.h"
#include "filter.h"
#include "prefix.h"
#include "log.h"
#include "memory.h"
#include "stream.h"
#include "hash.h"
#include "jhash.h"
#include "bitfield.h"
#include "zclient.h"
#include "bgpd/bgp_attr_evpn.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_mplsvpn.h"
#include "bgpd/bgp_label.h"
#include "bgpd/bgp_evpn.h"
#include "bgpd/bgp_evpn_private.h"
#include "bgpd/bgp_ecommunity.h"
#include "bgpd/bgp_encap_types.h"
#include "bgpd/bgp_debug.h"
#include "bgpd/bgp_aspath.h"
#include "bgpd/bgp_zebra.h"
#include "bgpd/bgp_nexthop.h"
/*
* Definitions and external declarations.
*/
extern struct zclient *zclient;
DEFINE_QOBJ_TYPE(bgpevpn)
/*
* Static function declarations
*/
static void delete_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
afi_t afi, safi_t safi, struct bgp_node *rn,
struct bgp_info **ri);
static int delete_all_vni_routes(struct bgp *bgp, struct bgpevpn *vpn);
/*
* Private functions.
*/
/*
* Make vni hash key.
*/
static unsigned int vni_hash_key_make(void *p)
{
struct bgpevpn *vpn = p;
return (jhash_1word(vpn->vni, 0));
}
/*
* Comparison function for vni hash
*/
static int vni_hash_cmp(const void *p1, const void *p2)
{
const struct bgpevpn *vpn1 = p1;
const struct bgpevpn *vpn2 = p2;
if (!vpn1 && !vpn2)
return 1;
if (!vpn1 || !vpn2)
return 0;
return (vpn1->vni == vpn2->vni);
}
/*
* Make import route target hash key.
*/
static unsigned int import_rt_hash_key_make(void *p)
{
struct irt_node *irt = p;
char *pnt = irt->rt.val;
unsigned int key = 0;
int c = 0;
key += pnt[c];
key += pnt[c + 1];
key += pnt[c + 2];
key += pnt[c + 3];
key += pnt[c + 4];
key += pnt[c + 5];
key += pnt[c + 6];
key += pnt[c + 7];
return (key);
}
/*
* Comparison function for import rt hash
*/
static int import_rt_hash_cmp(const void *p1, const void *p2)
{
const struct irt_node *irt1 = p1;
const struct irt_node *irt2 = p2;
if (irt1 == NULL && irt2 == NULL)
return 1;
if (irt1 == NULL || irt2 == NULL)
return 0;
return (memcmp(irt1->rt.val, irt2->rt.val, ECOMMUNITY_SIZE) == 0);
}
/*
* Create a new import_rt
*/
static struct irt_node *import_rt_new(struct bgp *bgp,
struct ecommunity_val *rt)
{
struct irt_node *irt;
if (!bgp)
return NULL;
irt = XCALLOC(MTYPE_BGP_EVPN_IMPORT_RT, sizeof(struct irt_node));
if (!irt)
return NULL;
irt->rt = *rt;
irt->vnis = list_new();
/* Add to hash */
if (!hash_get(bgp->import_rt_hash, irt, hash_alloc_intern)) {
XFREE(MTYPE_BGP_EVPN_IMPORT_RT, irt);
return NULL;
}
return irt;
}
/*
* Free the import rt node
*/
static void import_rt_free(struct bgp *bgp, struct irt_node *irt)
{
hash_release(bgp->import_rt_hash, irt);
XFREE(MTYPE_BGP_EVPN_IMPORT_RT, irt);
}
/*
* Function to lookup Import RT node - used to map a RT to set of
* VNIs importing routes with that RT.
*/
static struct irt_node *lookup_import_rt(struct bgp *bgp,
struct ecommunity_val *rt)
{
struct irt_node *irt;
struct irt_node tmp;
memset(&tmp, 0, sizeof(struct irt_node));
memcpy(&tmp.rt, rt, ECOMMUNITY_SIZE);
irt = hash_lookup(bgp->import_rt_hash, &tmp);
return irt;
}
/*
* Is specified VNI present on the RT's list of "importing" VNIs?
*/
static int is_vni_present_in_irt_vnis(struct list *vnis, struct bgpevpn *vpn)
{
struct listnode *node, *nnode;
struct bgpevpn *tmp_vpn;
for (ALL_LIST_ELEMENTS(vnis, node, nnode, tmp_vpn)) {
if (tmp_vpn == vpn)
return 1;
}
return 0;
}
/*
* Compare Route Targets.
*/
static int evpn_route_target_cmp(struct ecommunity *ecom1,
struct ecommunity *ecom2)
{
if (ecom1 && !ecom2)
return -1;
if (!ecom1 && ecom2)
return 1;
if (!ecom1 && !ecom2)
return 0;
if (ecom1->str && !ecom2->str)
return -1;
if (!ecom1->str && ecom2->str)
return 1;
if (!ecom1->str && !ecom2->str)
return 0;
return strcmp(ecom1->str, ecom2->str);
}
/*
* Mask off global-admin field of specified extended community (RT),
* just retain the local-admin field.
*/
static inline void mask_ecom_global_admin(struct ecommunity_val *dst,
struct ecommunity_val *src)
{
u_char type;
type = src->val[0];
dst->val[0] = 0;
if (type == ECOMMUNITY_ENCODE_AS) {
dst->val[2] = dst->val[3] = 0;
} else if (type == ECOMMUNITY_ENCODE_AS4
|| type == ECOMMUNITY_ENCODE_IP) {
dst->val[2] = dst->val[3] = 0;
dst->val[4] = dst->val[5] = 0;
}
}
/*
* Map one RT to specified VNI.
*/
static void map_vni_to_rt(struct bgp *bgp, struct bgpevpn *vpn,
struct ecommunity_val *eval)
{
struct irt_node *irt;
struct ecommunity_val eval_tmp;
/* If using "automatic" RT, we only care about the local-admin
* sub-field.
* This is to facilitate using VNI as the RT for EBGP peering too.
*/
memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
if (!is_import_rt_configured(vpn))
mask_ecom_global_admin(&eval_tmp, eval);
irt = lookup_import_rt(bgp, &eval_tmp);
if (irt && irt->vnis)
if (is_vni_present_in_irt_vnis(irt->vnis, vpn))
/* Already mapped. */
return;
if (!irt) {
irt = import_rt_new(bgp, &eval_tmp);
assert(irt);
}
/* Add VNI to the hash list for this RT. */
listnode_add(irt->vnis, vpn);
}
/*
* Unmap specified VNI from specified RT. If there are no other
* VNIs for this RT, then the RT hash is deleted.
*/
static void unmap_vni_from_rt(struct bgp *bgp, struct bgpevpn *vpn,
struct irt_node *irt)
{
/* Delete VNI from hash list for this RT. */
listnode_delete(irt->vnis, vpn);
if (!listnode_head(irt->vnis)) {
list_free(irt->vnis);
import_rt_free(bgp, irt);
}
}
/*
* Create RT extended community automatically from passed information:
* of the form AS:VNI.
* NOTE: We use only the lower 16 bits of the AS. This is sufficient as
* the need is to get a RT value that will be unique across different
* VNIs but the same across routers (in the same AS) for a particular
* VNI.
*/
static void form_auto_rt(struct bgp *bgp, struct bgpevpn *vpn, struct list *rtl)
{
struct ecommunity_val eval;
struct ecommunity *ecomadd;
encode_route_target_as((bgp->as & 0xFFFF), vpn->vni, &eval);
ecomadd = ecommunity_new();
ecommunity_add_val(ecomadd, &eval);
listnode_add_sort(rtl, ecomadd);
}
/*
* Derive RD and RT for a VNI automatically. Invoked at the time of
* creation of a VNI.
*/
static void derive_rd_rt_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
bgp_evpn_derive_auto_rd(bgp, vpn);
bgp_evpn_derive_auto_rt_import(bgp, vpn);
bgp_evpn_derive_auto_rt_export(bgp, vpn);
}
/*
* Add (update) or delete MACIP from zebra.
*/
static int bgp_zebra_send_remote_macip(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p,
struct in_addr remote_vtep_ip, int add,
u_char sticky)
{
struct stream *s;
int ipa_len;
char buf1[ETHER_ADDR_STRLEN];
char buf2[INET6_ADDRSTRLEN];
char buf3[INET6_ADDRSTRLEN];
/* Check socket. */
if (!zclient || zclient->sock < 0)
return 0;
/* Don't try to register if Zebra doesn't know of this instance. */
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
return 0;
s = zclient->obuf;
stream_reset(s);
zclient_create_header(s, add ? ZEBRA_REMOTE_MACIP_ADD
: ZEBRA_REMOTE_MACIP_DEL,
bgp->vrf_id);
stream_putl(s, vpn->vni);
stream_put(s, &p->prefix.mac.octet, ETH_ALEN); /* Mac Addr */
/* IP address length and IP address, if any. */
if (IS_EVPN_PREFIX_IPADDR_NONE(p))
stream_putl(s, 0);
else {
ipa_len = IS_EVPN_PREFIX_IPADDR_V4(p) ? IPV4_MAX_BYTELEN
: IPV6_MAX_BYTELEN;
stream_putl(s, ipa_len);
stream_put(s, &p->prefix.ip.ip.addr, ipa_len);
}
stream_put_in_addr(s, &remote_vtep_ip);
/* TX MAC sticky status */
if (add)
stream_putc(s, sticky);
stream_putw_at(s, 0, stream_get_endp(s));
if (bgp_debug_zebra(NULL))
zlog_debug("Tx %s MACIP, VNI %u %sMAC %s IP %s remote VTEP %s",
add ? "ADD" : "DEL", vpn->vni,
sticky ? "sticky " : "",
prefix_mac2str(&p->prefix.mac, buf1, sizeof(buf1)),
ipaddr2str(&p->prefix.ip, buf3, sizeof(buf3)),
inet_ntop(AF_INET, &remote_vtep_ip, buf2,
sizeof(buf2)));
return zclient_send_message(zclient);
}
/*
* Add (update) or delete remote VTEP from zebra.
*/
static int bgp_zebra_send_remote_vtep(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p, int add)
{
struct stream *s;
/* Check socket. */
if (!zclient || zclient->sock < 0)
return 0;
/* Don't try to register if Zebra doesn't know of this instance. */
if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
return 0;
s = zclient->obuf;
stream_reset(s);
zclient_create_header(s, add ? ZEBRA_REMOTE_VTEP_ADD
: ZEBRA_REMOTE_VTEP_DEL,
bgp->vrf_id);
stream_putl(s, vpn->vni);
if (IS_EVPN_PREFIX_IPADDR_V4(p))
stream_put_in_addr(s, &p->prefix.ip.ipaddr_v4);
else if (IS_EVPN_PREFIX_IPADDR_V6(p)) {
zlog_err(
"Bad remote IP when trying to %s remote VTEP for VNI %u",
add ? "ADD" : "DEL", vpn->vni);
return -1;
}
stream_putw_at(s, 0, stream_get_endp(s));
if (bgp_debug_zebra(NULL))
zlog_debug("Tx %s Remote VTEP, VNI %u remote VTEP %s",
add ? "ADD" : "DEL", vpn->vni,
inet_ntoa(p->prefix.ip.ipaddr_v4));
return zclient_send_message(zclient);
}
/*
* Build extended communities for EVPN route. RT and ENCAP are
* applicable to all routes.
*/
static void build_evpn_route_extcomm(struct bgpevpn *vpn, struct attr *attr)
{
struct ecommunity ecom_encap;
struct ecommunity ecom_sticky;
struct ecommunity_val eval;
struct ecommunity_val eval_sticky;
bgp_encap_types tnl_type;
struct listnode *node, *nnode;
struct ecommunity *ecom;
u_int32_t seqnum;
/* Encap */
tnl_type = BGP_ENCAP_TYPE_VXLAN;
memset(&ecom_encap, 0, sizeof(ecom_encap));
encode_encap_extcomm(tnl_type, &eval);
ecom_encap.size = 1;
ecom_encap.val = (u_int8_t *)eval.val;
/* Add Encap */
attr->ecommunity = ecommunity_dup(&ecom_encap);
/* Add the export RTs */
for (ALL_LIST_ELEMENTS(vpn->export_rtl, node, nnode, ecom))
attr->ecommunity = ecommunity_merge(attr->ecommunity, ecom);
if (attr->sticky) {
seqnum = 0;
memset(&ecom_sticky, 0, sizeof(ecom_sticky));
encode_mac_mobility_extcomm(1, seqnum, &eval_sticky);
ecom_sticky.size = 1;
ecom_sticky.val = (u_int8_t *)eval_sticky.val;
attr->ecommunity =
ecommunity_merge(attr->ecommunity, &ecom_sticky);
}
attr->flag |= ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES);
}
/*
* Add MAC mobility extended community to attribute.
*/
static void add_mac_mobility_to_attr(u_int32_t seq_num, struct attr *attr)
{
struct ecommunity ecom_tmp;
struct ecommunity_val eval;
u_int8_t *ecom_val_ptr;
int i;
u_int8_t *pnt;
int type = 0;
int sub_type = 0;
/* Build MM */
encode_mac_mobility_extcomm(0, seq_num, &eval);
/* Find current MM ecommunity */
ecom_val_ptr = NULL;
if (attr->ecommunity) {
for (i = 0; i < attr->ecommunity->size; i++) {
pnt = attr->ecommunity->val + (i * 8);
type = *pnt++;
sub_type = *pnt++;
if (type == ECOMMUNITY_ENCODE_EVPN
&& sub_type
== ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY) {
ecom_val_ptr =
(u_int8_t *)(attr->ecommunity->val
+ (i * 8));
break;
}
}
}
/* Update the existing MM ecommunity */
if (ecom_val_ptr) {
memcpy(ecom_val_ptr, eval.val, sizeof(char) * ECOMMUNITY_SIZE);
}
/* Add MM to existing */
else {
memset(&ecom_tmp, 0, sizeof(ecom_tmp));
ecom_tmp.size = 1;
ecom_tmp.val = (u_int8_t *)eval.val;
attr->ecommunity =
ecommunity_merge(attr->ecommunity, &ecom_tmp);
}
}
/* Install EVPN route into zebra. */
static int evpn_zebra_install(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p,
struct in_addr remote_vtep_ip, u_char sticky)
{
int ret;
if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
ret = bgp_zebra_send_remote_macip(bgp, vpn, p, remote_vtep_ip,
1, sticky);
else
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, 1);
return ret;
}
/* Uninstall EVPN route from zebra. */
static int evpn_zebra_uninstall(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p,
struct in_addr remote_vtep_ip)
{
int ret;
if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
ret = bgp_zebra_send_remote_macip(bgp, vpn, p, remote_vtep_ip,
0, 0);
else
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, 0);
return ret;
}
/*
* Due to MAC mobility, the prior "local" best route has been supplanted
* by a "remote" best route. The prior route has to be deleted and withdrawn
* from peers.
*/
static void evpn_delete_old_local_route(struct bgp *bgp, struct bgpevpn *vpn,
struct bgp_node *rn,
struct bgp_info *old_local)
{
struct bgp_node *global_rn;
struct bgp_info *ri;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
/* Locate route node in the global EVPN routing table. Note that
* this table is a 2-level tree (RD-level + Prefix-level) similar to
* L3VPN routes.
*/
global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
(struct prefix *)&rn->p, &vpn->prd);
if (global_rn) {
/* Delete route entry in the global EVPN table. */
delete_evpn_route_entry(bgp, vpn, afi, safi, global_rn, &ri);
/* Schedule for processing - withdraws to peers happen from
* this table.
*/
if (ri)
bgp_process(bgp, global_rn, afi, safi);
bgp_unlock_node(global_rn);
}
/* Delete route entry in the VNI route table, caller to remove. */
bgp_info_delete(rn, old_local);
}
/*
* Calculate the best path for an EVPN route. Install/update best path in zebra,
* if appropriate.
*/
static int evpn_route_select_install(struct bgp *bgp, struct bgpevpn *vpn,
struct bgp_node *rn)
{
struct bgp_info *old_select, *new_select;
struct bgp_info_pair old_and_new;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
int ret = 0;
/* Compute the best path. */
bgp_best_selection(bgp, rn, &bgp->maxpaths[afi][safi], &old_and_new,
afi, safi);
old_select = old_and_new.old;
new_select = old_and_new.new;
/* If the best path hasn't changed - see if there is still something to
* update
* to zebra RIB.
*/
if (old_select && old_select == new_select
&& old_select->type == ZEBRA_ROUTE_BGP
&& old_select->sub_type == BGP_ROUTE_NORMAL
&& !CHECK_FLAG(rn->flags, BGP_NODE_USER_CLEAR)
&& !CHECK_FLAG(old_select->flags, BGP_INFO_ATTR_CHANGED)
&& !bgp->addpath_tx_used[afi][safi]) {
if (bgp_zebra_has_route_changed(rn, old_select))
ret = evpn_zebra_install(bgp, vpn,
(struct prefix_evpn *)&rn->p,
old_select->attr->nexthop,
old_select->attr->sticky);
UNSET_FLAG(old_select->flags, BGP_INFO_MULTIPATH_CHG);
bgp_zebra_clear_route_change_flags(rn);
return ret;
}
/* If the user did a "clear" this flag will be set */
UNSET_FLAG(rn->flags, BGP_NODE_USER_CLEAR);
/* bestpath has changed; update relevant fields and install or uninstall
* into the zebra RIB.
*/
if (old_select || new_select)
bgp_bump_version(rn);
if (old_select)
bgp_info_unset_flag(rn, old_select, BGP_INFO_SELECTED);
if (new_select) {
bgp_info_set_flag(rn, new_select, BGP_INFO_SELECTED);
bgp_info_unset_flag(rn, new_select, BGP_INFO_ATTR_CHANGED);
UNSET_FLAG(new_select->flags, BGP_INFO_MULTIPATH_CHG);
}
if (new_select && new_select->type == ZEBRA_ROUTE_BGP
&& new_select->sub_type == BGP_ROUTE_NORMAL) {
ret = evpn_zebra_install(bgp, vpn, (struct prefix_evpn *)&rn->p,
new_select->attr->nexthop,
new_select->attr->sticky);
/* If an old best existed and it was a "local" route, the only
* reason
* it would be supplanted is due to MAC mobility procedures. So,
* we
* need to do an implicit delete and withdraw that route from
* peers.
*/
if (old_select && old_select->peer == bgp->peer_self
&& old_select->type == ZEBRA_ROUTE_BGP
&& old_select->sub_type == BGP_ROUTE_STATIC)
evpn_delete_old_local_route(bgp, vpn, rn, old_select);
} else {
if (old_select && old_select->type == ZEBRA_ROUTE_BGP
&& old_select->sub_type == BGP_ROUTE_NORMAL)
ret = evpn_zebra_uninstall(bgp, vpn,
(struct prefix_evpn *)&rn->p,
old_select->attr->nexthop);
}
/* Clear any route change flags. */
bgp_zebra_clear_route_change_flags(rn);
/* Reap old select bgp_info, if it has been removed */
if (old_select && CHECK_FLAG(old_select->flags, BGP_INFO_REMOVED))
bgp_info_reap(rn, old_select);
return ret;
}
/*
* Return true if the local ri for this rn has sticky set
*/
static int evpn_route_is_sticky(struct bgp *bgp, struct bgp_node *rn)
{
struct bgp_info *tmp_ri;
struct bgp_info *local_ri;
local_ri = NULL;
for (tmp_ri = rn->info; tmp_ri; tmp_ri = tmp_ri->next) {
if (tmp_ri->peer == bgp->peer_self
&& tmp_ri->type == ZEBRA_ROUTE_BGP
&& tmp_ri->sub_type == BGP_ROUTE_STATIC)
local_ri = tmp_ri;
}
if (!local_ri)
return 0;
return local_ri->attr->sticky;
}
/*
* Create or update EVPN route entry. This could be in the VNI route table
* or the global route table.
*/
static int update_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
afi_t afi, safi_t safi, struct bgp_node *rn,
struct attr *attr, int add, int vni_table,
struct bgp_info **ri, u_char flags)
{
struct bgp_info *tmp_ri;
struct bgp_info *local_ri, *remote_ri;
struct attr *attr_new;
mpls_label_t label = MPLS_INVALID_LABEL;
int route_change = 1;
u_char sticky = 0;
*ri = NULL;
/* See if this is an update of an existing route, or a new add. Also,
* identify if already known from remote, and if so, the one with the
* highest sequence number; this is only when adding to the VNI routing
* table.
*/
local_ri = remote_ri = NULL;
for (tmp_ri = rn->info; tmp_ri; tmp_ri = tmp_ri->next) {
if (tmp_ri->peer == bgp->peer_self
&& tmp_ri->type == ZEBRA_ROUTE_BGP
&& tmp_ri->sub_type == BGP_ROUTE_STATIC)
local_ri = tmp_ri;
if (vni_table) {
if (tmp_ri->type == ZEBRA_ROUTE_BGP
&& tmp_ri->sub_type == BGP_ROUTE_NORMAL
&& CHECK_FLAG(tmp_ri->flags, BGP_INFO_VALID)) {
if (!remote_ri)
remote_ri = tmp_ri;
else if (mac_mobility_seqnum(tmp_ri->attr)
> mac_mobility_seqnum(remote_ri->attr))
remote_ri = tmp_ri;
}
}
}
/* If route doesn't exist already, create a new one, if told to.
* Otherwise act based on whether the attributes of the route have
* changed or not.
*/
if (!local_ri && !add)
return 0;
if (!local_ri) {
/* When learnt locally for the first time but already known from
* remote, we have to initiate appropriate MAC mobility steps.
* This
* is applicable when updating the VNI routing table.
* We need to skip mobility steps for g/w macs (local mac on g/w
* SVI) advertised in EVPN.
* This will ensure that local routes are preferred for g/w macs
*/
if (remote_ri && !CHECK_FLAG(flags, ZEBRA_MAC_TYPE_GW)) {
u_int32_t cur_seqnum;
/* Add MM extended community to route. */
cur_seqnum = mac_mobility_seqnum(remote_ri->attr);
add_mac_mobility_to_attr(cur_seqnum + 1, attr);
}
/* Add (or update) attribute to hash. */
attr_new = bgp_attr_intern(attr);
/* Extract MAC mobility sequence number, if any. */
attr_new->mm_seqnum =
bgp_attr_mac_mobility_seqnum(attr_new, &sticky);
attr_new->sticky = sticky;
/* Create new route with its attribute. */
tmp_ri = info_make(ZEBRA_ROUTE_BGP, BGP_ROUTE_STATIC, 0,
bgp->peer_self, attr_new, rn);
SET_FLAG(tmp_ri->flags, BGP_INFO_VALID);
bgp_info_extra_get(tmp_ri);
/* The VNI goes into the 'label' field of the route */
vni2label(vpn->vni, &label);
memcpy(&tmp_ri->extra->label, &label, BGP_LABEL_BYTES);
bgp_info_add(rn, tmp_ri);
} else {
tmp_ri = local_ri;
if (attrhash_cmp(tmp_ri->attr, attr)
&& !CHECK_FLAG(tmp_ri->flags, BGP_INFO_REMOVED))
route_change = 0;
else {
/* The attribute has changed. */
/* Add (or update) attribute to hash. */
attr_new = bgp_attr_intern(attr);
bgp_info_set_flag(rn, tmp_ri, BGP_INFO_ATTR_CHANGED);
/* Restore route, if needed. */
if (CHECK_FLAG(tmp_ri->flags, BGP_INFO_REMOVED))
bgp_info_restore(rn, tmp_ri);
/* Unintern existing, set to new. */
bgp_attr_unintern(&tmp_ri->attr);
tmp_ri->attr = attr_new;
tmp_ri->uptime = bgp_clock();
}
}
/* Return back the route entry. */
*ri = tmp_ri;
return route_change;
}
/*
* Create or update EVPN route (of type based on prefix) for specified VNI
* and schedule for processing.
*/
static int update_evpn_route(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p, u_char flags)
{
struct bgp_node *rn;
struct attr attr;
struct attr *attr_new;
struct bgp_info *ri;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
int route_change;
memset(&attr, 0, sizeof(struct attr));
/* Build path-attribute for this route. */
bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
attr.nexthop = vpn->originator_ip;
attr.mp_nexthop_global_in = vpn->originator_ip;
attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
attr.sticky = CHECK_FLAG(flags, ZEBRA_MAC_TYPE_STICKY) ? 1 : 0;
/* Set up RT and ENCAP extended community. */
build_evpn_route_extcomm(vpn, &attr);
/* First, create (or fetch) route node within the VNI. */
/* NOTE: There is no RD here. */
rn = bgp_node_get(vpn->route_table, (struct prefix *)p);
/* Create or update route entry. */
route_change = update_evpn_route_entry(bgp, vpn, afi, safi, rn, &attr,
1, 1, &ri, flags);
assert(ri);
attr_new = ri->attr;
/* Perform route selection; this is just to set the flags correctly
* as local route in the VNI always wins.
*/
evpn_route_select_install(bgp, vpn, rn);
bgp_unlock_node(rn);
/* If this is a new route or some attribute has changed, export the
* route to the global table. The route will be advertised to peers
* from there. Note that this table is a 2-level tree (RD-level +
* Prefix-level) similar to L3VPN routes.
*/
if (route_change) {
struct bgp_info *global_ri;
rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
(struct prefix *)p, &vpn->prd);
update_evpn_route_entry(bgp, vpn, afi, safi, rn, attr_new, 1, 0,
&global_ri, flags);
/* Schedule for processing and unlock node. */
bgp_process(bgp, rn, afi, safi);
bgp_unlock_node(rn);
}
/* Unintern temporary. */
aspath_unintern(&attr.aspath);
return 0;
}
/*
* Delete EVPN route entry. This could be in the VNI route table
* or the global route table.
*/
static void delete_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
afi_t afi, safi_t safi, struct bgp_node *rn,
struct bgp_info **ri)
{
struct bgp_info *tmp_ri;
*ri = NULL;
/* Now, find matching route. */
for (tmp_ri = rn->info; tmp_ri; tmp_ri = tmp_ri->next)
if (tmp_ri->peer == bgp->peer_self
&& tmp_ri->type == ZEBRA_ROUTE_BGP
&& tmp_ri->sub_type == BGP_ROUTE_STATIC)
break;
*ri = tmp_ri;
/* Mark route for delete. */
if (tmp_ri)
bgp_info_delete(rn, tmp_ri);
}
/*
* Delete EVPN route (of type based on prefix) for specified VNI and
* schedule for processing.
*/
static int delete_evpn_route(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p)
{
struct bgp_node *rn, *global_rn;
struct bgp_info *ri;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
/* First, locate the route node within the VNI. If it doesn't exist,
* there
* is nothing further to do.
*/
/* NOTE: There is no RD here. */
rn = bgp_node_lookup(vpn->route_table, (struct prefix *)p);
if (!rn)
return 0;
/* Next, locate route node in the global EVPN routing table. Note that
* this table is a 2-level tree (RD-level + Prefix-level) similar to
* L3VPN routes.
*/
global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
(struct prefix *)p, &vpn->prd);
if (global_rn) {
/* Delete route entry in the global EVPN table. */
delete_evpn_route_entry(bgp, vpn, afi, safi, global_rn, &ri);
/* Schedule for processing - withdraws to peers happen from
* this table.
*/
if (ri)
bgp_process(bgp, global_rn, afi, safi);
bgp_unlock_node(global_rn);
}
/* Delete route entry in the VNI route table. This can just be removed.
*/
delete_evpn_route_entry(bgp, vpn, afi, safi, rn, &ri);
if (ri)
bgp_info_reap(rn, ri);
bgp_unlock_node(rn);
return 0;
}
/*
* Update all type-2 (MACIP) local routes for this VNI - these should also
* be scheduled for advertise to peers.
*/
static int update_all_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
afi_t afi;
safi_t safi;
struct bgp_node *rn;
struct bgp_info *ri;
struct attr attr;
struct attr attr_sticky;
struct attr *attr_new;
afi = AFI_L2VPN;
safi = SAFI_EVPN;
memset(&attr, 0, sizeof(struct attr));
memset(&attr_sticky, 0, sizeof(struct attr));
/* Build path-attribute - all type-2 routes for this VNI will share the
* same path attribute.
*/
bgp_attr_default_set(&attr, BGP_ORIGIN_IGP);
bgp_attr_default_set(&attr_sticky, BGP_ORIGIN_IGP);
attr.nexthop = vpn->originator_ip;
attr.mp_nexthop_global_in = vpn->originator_ip;
attr.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
attr_sticky.nexthop = vpn->originator_ip;
attr_sticky.mp_nexthop_global_in = vpn->originator_ip;
attr_sticky.mp_nexthop_len = BGP_ATTR_NHLEN_IPV4;
attr_sticky.sticky = 1;
/* Set up RT, ENCAP and sticky MAC extended community. */
build_evpn_route_extcomm(vpn, &attr);
build_evpn_route_extcomm(vpn, &attr_sticky);
/* Walk this VNI's route table and update local type-2 routes. For any
* routes updated, update corresponding entry in the global table too.
*/
for (rn = bgp_table_top(vpn->route_table); rn;
rn = bgp_route_next(rn)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
struct bgp_node *rd_rn;
struct bgp_info *global_ri;
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
if (evpn_route_is_sticky(bgp, rn))
update_evpn_route_entry(bgp, vpn, afi, safi, rn,
&attr_sticky, 0, 1, &ri, 0);
else
update_evpn_route_entry(bgp, vpn, afi, safi, rn, &attr,
0, 1, &ri, 0);
/* If a local route exists for this prefix, we need to update
* the global routing table too.
*/
if (!ri)
continue;
/* Perform route selection; this is just to set the flags
* correctly
* as local route in the VNI always wins.
*/
evpn_route_select_install(bgp, vpn, rn);
attr_new = ri->attr;
/* Update route in global routing table. */
rd_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
(struct prefix *)evp, &vpn->prd);
assert(rd_rn);
update_evpn_route_entry(bgp, vpn, afi, safi, rd_rn, attr_new, 0,
0, &global_ri, 0);
/* Schedule for processing and unlock node. */
bgp_process(bgp, rd_rn, afi, safi);
bgp_unlock_node(rd_rn);
}
/* Unintern temporary. */
aspath_unintern(&attr.aspath);
aspath_unintern(&attr_sticky.aspath);
return 0;
}
/*
* Delete all type-2 (MACIP) local routes for this VNI - only from the
* global routing table. These are also scheduled for withdraw from peers.
*/
static int delete_global_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
afi_t afi;
safi_t safi;
struct bgp_node *rdrn, *rn;
struct bgp_table *table;
struct bgp_info *ri;
afi = AFI_L2VPN;
safi = SAFI_EVPN;
rdrn = bgp_node_lookup(bgp->rib[afi][safi], (struct prefix *)&vpn->prd);
if (rdrn && rdrn->info) {
table = (struct bgp_table *)rdrn->info;
for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
delete_evpn_route_entry(bgp, vpn, afi, safi, rn, &ri);
if (ri)
bgp_process(bgp, rn, afi, safi);
}
}
/* Unlock RD node. */
if (rdrn)
bgp_unlock_node(rdrn);
return 0;
}
/*
* Delete all type-2 (MACIP) local routes for this VNI - from the global
* table as well as the per-VNI route table.
*/
static int delete_all_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
afi_t afi;
safi_t safi;
struct bgp_node *rn;
struct bgp_info *ri;
afi = AFI_L2VPN;
safi = SAFI_EVPN;
/* First, walk the global route table for this VNI's type-2 local
* routes.
* EVPN routes are a 2-level table, first get the RD table.
*/
delete_global_type2_routes(bgp, vpn);
/* Next, walk this VNI's route table and delete local type-2 routes. */
for (rn = bgp_table_top(vpn->route_table); rn;
rn = bgp_route_next(rn)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
delete_evpn_route_entry(bgp, vpn, afi, safi, rn, &ri);
/* Route entry in local table gets deleted immediately. */
if (ri)
bgp_info_reap(rn, ri);
}
return 0;
}
/*
* Delete all routes in the per-VNI route table.
*/
static int delete_all_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
struct bgp_node *rn;
struct bgp_info *ri, *nextri;
/* Walk this VNI's route table and delete all routes. */
for (rn = bgp_table_top(vpn->route_table); rn;
rn = bgp_route_next(rn)) {
for (ri = rn->info; (ri != NULL) && (nextri = ri->next, 1);
ri = nextri) {
bgp_info_delete(rn, ri);
bgp_info_reap(rn, ri);
}
}
return 0;
}
/*
* Update (and advertise) local routes for a VNI. Invoked upon the VNI
* export RT getting modified or change to tunnel IP. Note that these
* situations need the route in the per-VNI table as well as the global
* table to be updated (as attributes change).
*/
static int update_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
int ret;
struct prefix_evpn p;
/* Update and advertise the type-3 route (only one) followed by the
* locally learnt type-2 routes (MACIP) - for this VNI.
*/
build_evpn_type3_prefix(&p, vpn->originator_ip);
ret = update_evpn_route(bgp, vpn, &p, 0);
if (ret)
return ret;
return update_all_type2_routes(bgp, vpn);
}
/*
* Delete (and withdraw) local routes for specified VNI from the global
* table and per-VNI table. After this, remove all other routes from
* the per-VNI table. Invoked upon the VNI being deleted or EVPN
* (advertise-all-vni) being disabled.
*/
static int delete_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
int ret;
struct prefix_evpn p;
/* Delete and withdraw locally learnt type-2 routes (MACIP)
* followed by type-3 routes (only one) - for this VNI.
*/
ret = delete_all_type2_routes(bgp, vpn);
if (ret)
return ret;
build_evpn_type3_prefix(&p, vpn->originator_ip);
ret = delete_evpn_route(bgp, vpn, &p);
if (ret)
return ret;
/* Delete all routes from the per-VNI table. */
return delete_all_vni_routes(bgp, vpn);
}
/*
* There is a tunnel endpoint IP address change for this VNI,
* need to re-advertise routes with the new nexthop.
*/
static int handle_tunnel_ip_change(struct bgp *bgp, struct bgpevpn *vpn,
struct in_addr originator_ip)
{
struct prefix_evpn p;
/* If VNI is not live, we only need to update the originator ip */
if (!is_vni_live(vpn)) {
vpn->originator_ip = originator_ip;
return 0;
}
/* Update the tunnel-ip hash */
bgp_tip_del(bgp, &vpn->originator_ip);
bgp_tip_add(bgp, &originator_ip);
/* filter routes as martian nexthop db has changed */
bgp_filter_evpn_routes_upon_martian_nh_change(bgp);
/* Need to withdraw type-3 route as the originator IP is part
* of the key.
*/
build_evpn_type3_prefix(&p, vpn->originator_ip);
delete_evpn_route(bgp, vpn, &p);
/* Update the tunnel IP and re-advertise all routes for this VNI. */
vpn->originator_ip = originator_ip;
return update_routes_for_vni(bgp, vpn);
}
/*
* Install route entry into the VNI routing table and invoke route selection.
*/
static int install_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p,
struct bgp_info *parent_ri)
{
struct bgp_node *rn;
struct bgp_info *ri;
struct attr *attr_new;
int ret;
/* Create (or fetch) route within the VNI. */
/* NOTE: There is no RD here. */
rn = bgp_node_get(vpn->route_table, (struct prefix *)p);
/* Check if route entry is already present. */
for (ri = rn->info; ri; ri = ri->next)
if (ri->extra
&& (struct bgp_info *)ri->extra->parent == parent_ri)
break;
if (!ri) {
/* Add (or update) attribute to hash. */
attr_new = bgp_attr_intern(parent_ri->attr);
/* Create new route with its attribute. */
ri = info_make(parent_ri->type, parent_ri->sub_type, 0,
parent_ri->peer, attr_new, rn);
SET_FLAG(ri->flags, BGP_INFO_VALID);
bgp_info_extra_get(ri);
ri->extra->parent = parent_ri;
if (parent_ri->extra)
memcpy(&ri->extra->label, &parent_ri->extra->label,
BGP_LABEL_BYTES);
bgp_info_add(rn, ri);
} else {
if (attrhash_cmp(ri->attr, parent_ri->attr)
&& !CHECK_FLAG(ri->flags, BGP_INFO_REMOVED)) {
bgp_unlock_node(rn);
return 0;
}
/* The attribute has changed. */
/* Add (or update) attribute to hash. */
attr_new = bgp_attr_intern(parent_ri->attr);
/* Restore route, if needed. */
if (CHECK_FLAG(ri->flags, BGP_INFO_REMOVED))
bgp_info_restore(rn, ri);
/* Mark if nexthop has changed. */
if (!IPV4_ADDR_SAME(&ri->attr->nexthop, &attr_new->nexthop))
SET_FLAG(ri->flags, BGP_INFO_IGP_CHANGED);
/* Unintern existing, set to new. */
bgp_attr_unintern(&ri->attr);
ri->attr = attr_new;
ri->uptime = bgp_clock();
}
/* Perform route selection and update zebra, if required. */
ret = evpn_route_select_install(bgp, vpn, rn);
return ret;
}
/*
* Uninstall route entry from the VNI routing table and send message
* to zebra, if appropriate.
*/
static int uninstall_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p,
struct bgp_info *parent_ri)
{
struct bgp_node *rn;
struct bgp_info *ri;
int ret;
/* Locate route within the VNI. */
/* NOTE: There is no RD here. */
rn = bgp_node_lookup(vpn->route_table, (struct prefix *)p);
if (!rn)
return 0;
/* Find matching route entry. */
for (ri = rn->info; ri; ri = ri->next)
if (ri->extra
&& (struct bgp_info *)ri->extra->parent == parent_ri)
break;
if (!ri)
return 0;
/* Mark entry for deletion */
bgp_info_delete(rn, ri);
/* Perform route selection and update zebra, if required. */
ret = evpn_route_select_install(bgp, vpn, rn);
/* Unlock route node. */
bgp_unlock_node(rn);
return ret;
}
/*
* Given a route entry and a VNI, see if this route entry should be
* imported into the VNI i.e., RTs match.
*/
static int is_route_matching_for_vni(struct bgp *bgp, struct bgpevpn *vpn,
struct bgp_info *ri)
{
struct attr *attr = ri->attr;
struct ecommunity *ecom;
int i;
assert(attr);
/* Route should have valid RT to be even considered. */
if (!(attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)))
return 0;
ecom = attr->ecommunity;
if (!ecom || !ecom->size)
return 0;
/* For each extended community RT, see if it matches this VNI. If any RT
* matches, we're done.
*/
for (i = 0; i < ecom->size; i++) {
u_char *pnt;
u_char type, sub_type;
struct ecommunity_val *eval;
struct ecommunity_val eval_tmp;
struct irt_node *irt;
/* Only deal with RTs */
pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
eval = (struct ecommunity_val *)(ecom->val
+ (i * ECOMMUNITY_SIZE));
type = *pnt++;
sub_type = *pnt++;
if (sub_type != ECOMMUNITY_ROUTE_TARGET)
continue;
/* See if this RT matches specified VNIs import RTs */
irt = lookup_import_rt(bgp, eval);
if (irt && irt->vnis)
if (is_vni_present_in_irt_vnis(irt->vnis, vpn))
return 1;
/* Also check for non-exact match. In this, we mask out the AS
* and
* only check on the local-admin sub-field. This is to
* facilitate using
* VNI as the RT for EBGP peering too.
*/
irt = NULL;
if (type == ECOMMUNITY_ENCODE_AS
|| type == ECOMMUNITY_ENCODE_AS4
|| type == ECOMMUNITY_ENCODE_IP) {
memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
mask_ecom_global_admin(&eval_tmp, eval);
irt = lookup_import_rt(bgp, &eval_tmp);
}
if (irt && irt->vnis)
if (is_vni_present_in_irt_vnis(irt->vnis, vpn))
return 1;
}
return 0;
}
/*
* Install or uninstall routes of specified type that are appropriate for this
* particular VNI.
*/
static int install_uninstall_routes_for_vni(struct bgp *bgp,
struct bgpevpn *vpn,
bgp_evpn_route_type rtype,
int install)
{
afi_t afi;
safi_t safi;
struct bgp_node *rd_rn, *rn;
struct bgp_table *table;
struct bgp_info *ri;
int ret;
afi = AFI_L2VPN;
safi = SAFI_EVPN;
/* Walk entire global routing table and evaluate routes which could be
* imported into this VPN. Note that we cannot just look at the routes
* for
* the VNI's RD - remote routes applicable for this VNI could have any
* RD.
*/
/* EVPN routes are a 2-level table. */
for (rd_rn = bgp_table_top(bgp->rib[afi][safi]); rd_rn;
rd_rn = bgp_route_next(rd_rn)) {
table = (struct bgp_table *)(rd_rn->info);
if (!table)
continue;
for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
if (evp->prefix.route_type != rtype)
continue;
for (ri = rn->info; ri; ri = ri->next) {
/* Consider "valid" remote routes applicable for
* this VNI. */
if (!(CHECK_FLAG(ri->flags, BGP_INFO_VALID)
&& ri->type == ZEBRA_ROUTE_BGP
&& ri->sub_type == BGP_ROUTE_NORMAL))
continue;
if (is_route_matching_for_vni(bgp, vpn, ri)) {
if (install)
ret = install_evpn_route_entry(
bgp, vpn, evp, ri);
else
ret = uninstall_evpn_route_entry(
bgp, vpn, evp, ri);
if (ret) {
zlog_err(
"%u: Failed to %s EVPN %s route in VNI %u",
bgp->vrf_id,
install ? "install"
: "uninstall",
rtype == BGP_EVPN_MAC_IP_ROUTE
? "MACIP"
: "IMET",
vpn->vni);
return ret;
}
}
}
}
}
return 0;
}
/*
* Install any existing remote routes applicable for this VNI into its
* routing table. This is invoked when a VNI becomes "live" or its Import
* RT is changed.
*/
static int install_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
int ret;
/* Install type-3 routes followed by type-2 routes - the ones applicable
* for this VNI.
*/
ret = install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_IMET_ROUTE,
1);
if (ret)
return ret;
return install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_MAC_IP_ROUTE,
1);
}
/*
* Uninstall any existing remote routes for this VNI. One scenario in which
* this is invoked is upon an import RT change.
*/
static int uninstall_routes_for_vni(struct bgp *bgp, struct bgpevpn *vpn)
{
int ret;
/* Uninstall type-2 routes followed by type-3 routes - the ones
* applicable
* for this VNI.
*/
ret = install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_MAC_IP_ROUTE,
0);
if (ret)
return ret;
return install_uninstall_routes_for_vni(bgp, vpn, BGP_EVPN_IMET_ROUTE,
0);
}
/*
* Install or uninstall route in matching VNIs (list).
*/
static int install_uninstall_route_in_vnis(struct bgp *bgp, afi_t afi,
safi_t safi, struct prefix_evpn *evp,
struct bgp_info *ri,
struct list *vnis, int install)
{
struct bgpevpn *vpn;
struct listnode *node, *nnode;
for (ALL_LIST_ELEMENTS(vnis, node, nnode, vpn)) {
int ret;
if (!is_vni_live(vpn))
continue;
if (install)
ret = install_evpn_route_entry(bgp, vpn, evp, ri);
else
ret = uninstall_evpn_route_entry(bgp, vpn, evp, ri);
if (ret) {
zlog_err("%u: Failed to %s EVPN %s route in VNI %u",
bgp->vrf_id, install ? "install" : "uninstall",
evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
? "MACIP"
: "IMET",
vpn->vni);
return ret;
}
}
return 0;
}
/*
* Install or uninstall route for appropriate VNIs.
*/
static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
struct prefix *p, struct bgp_info *ri,
int import)
{
struct prefix_evpn *evp = (struct prefix_evpn *)p;
struct attr *attr = ri->attr;
struct ecommunity *ecom;
int i;
assert(attr);
/* Only type-2 and type-3 routes go into a L2 VNI. */
if (!(evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE
|| evp->prefix.route_type == BGP_EVPN_IMET_ROUTE))
return 0;
/* If we don't have Route Target, nothing much to do. */
if (!(attr->flag & ATTR_FLAG_BIT(BGP_ATTR_EXT_COMMUNITIES)))
return 0;
ecom = attr->ecommunity;
if (!ecom || !ecom->size)
return -1;
/* For each extended community RT, see which VNIs match and import
* the route into matching VNIs.
*/
for (i = 0; i < ecom->size; i++) {
u_char *pnt;
u_char type, sub_type;
struct ecommunity_val *eval;
struct ecommunity_val eval_tmp;
struct irt_node *irt;
/* Only deal with RTs */
pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
eval = (struct ecommunity_val *)(ecom->val
+ (i * ECOMMUNITY_SIZE));
type = *pnt++;
sub_type = *pnt++;
if (sub_type != ECOMMUNITY_ROUTE_TARGET)
continue;
/* Are we interested in this RT? */
irt = lookup_import_rt(bgp, eval);
if (irt && irt->vnis)
install_uninstall_route_in_vnis(bgp, afi, safi, evp, ri,
irt->vnis, import);
/* Also check for non-exact match. In this, we mask out the AS
* and
* only check on the local-admin sub-field. This is to
* facilitate using
* VNI as the RT for EBGP peering too.
*/
irt = NULL;
if (type == ECOMMUNITY_ENCODE_AS
|| type == ECOMMUNITY_ENCODE_AS4
|| type == ECOMMUNITY_ENCODE_IP) {
memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
mask_ecom_global_admin(&eval_tmp, eval);
irt = lookup_import_rt(bgp, &eval_tmp);
}
if (irt && irt->vnis)
install_uninstall_route_in_vnis(bgp, afi, safi, evp, ri,
irt->vnis, import);
}
return 0;
}
/*
* Update and advertise local routes for a VNI. Invoked upon router-id
* change. Note that the processing is done only on the global route table
* using routes that already exist in the per-VNI table.
*/
static int update_advertise_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
struct prefix_evpn p;
struct bgp_node *rn, *global_rn;
struct bgp_info *ri, *global_ri;
struct attr *attr;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
/* Locate type-3 route for VNI in the per-VNI table and use its
* attributes to create and advertise the type-3 route for this VNI
* in the global table.
*/
build_evpn_type3_prefix(&p, vpn->originator_ip);
rn = bgp_node_lookup(vpn->route_table, (struct prefix *)&p);
if (!rn) /* unexpected */
return 0;
for (ri = rn->info; ri; ri = ri->next)
if (ri->peer == bgp->peer_self && ri->type == ZEBRA_ROUTE_BGP
&& ri->sub_type == BGP_ROUTE_STATIC)
break;
if (!ri) /* unexpected */
return 0;
attr = ri->attr;
global_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
(struct prefix *)&p, &vpn->prd);
update_evpn_route_entry(bgp, vpn, afi, safi, global_rn, attr, 1, 0, &ri,
0);
/* Schedule for processing and unlock node. */
bgp_process(bgp, global_rn, afi, safi);
bgp_unlock_node(global_rn);
/* Now, walk this VNI's route table and use the route and its attribute
* to create and schedule route in global table.
*/
for (rn = bgp_table_top(vpn->route_table); rn;
rn = bgp_route_next(rn)) {
struct prefix_evpn *evp = (struct prefix_evpn *)&rn->p;
/* Identify MAC-IP local routes. */
if (evp->prefix.route_type != BGP_EVPN_MAC_IP_ROUTE)
continue;
for (ri = rn->info; ri; ri = ri->next)
if (ri->peer == bgp->peer_self
&& ri->type == ZEBRA_ROUTE_BGP
&& ri->sub_type == BGP_ROUTE_STATIC)
break;
if (!ri)
continue;
/* Create route in global routing table using this route entry's
* attribute.
*/
attr = ri->attr;
global_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
(struct prefix *)evp, &vpn->prd);
assert(global_rn);
update_evpn_route_entry(bgp, vpn, afi, safi, global_rn, attr, 1,
0, &global_ri, 0);
/* Schedule for processing and unlock node. */
bgp_process(bgp, global_rn, afi, safi);
bgp_unlock_node(global_rn);
}
return 0;
}
/*
* Delete (and withdraw) local routes for a VNI - only from the global
* table. Invoked upon router-id change.
*/
static int delete_withdraw_vni_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
int ret;
struct prefix_evpn p;
struct bgp_node *global_rn;
struct bgp_info *ri;
afi_t afi = AFI_L2VPN;
safi_t safi = SAFI_EVPN;
/* Delete and withdraw locally learnt type-2 routes (MACIP)
* for this VNI - from the global table.
*/
ret = delete_global_type2_routes(bgp, vpn);
if (ret)
return ret;
/* Remove type-3 route for this VNI from global table. */
build_evpn_type3_prefix(&p, vpn->originator_ip);
global_rn = bgp_afi_node_lookup(bgp->rib[afi][safi], afi, safi,
(struct prefix *)&p, &vpn->prd);
if (global_rn) {
/* Delete route entry in the global EVPN table. */
delete_evpn_route_entry(bgp, vpn, afi, safi, global_rn, &ri);
/* Schedule for processing - withdraws to peers happen from
* this table.
*/
if (ri)
bgp_process(bgp, global_rn, afi, safi);
bgp_unlock_node(global_rn);
}
return 0;
}
/*
* Handle router-id change. Update and advertise local routes corresponding
* to this VNI from peers. Note that this is invoked after updating the
* router-id. The routes in the per-VNI table are used to create routes in
* the global table and schedule them.
*/
static void update_router_id_vni(struct hash_backet *backet, struct bgp *bgp)
{
struct bgpevpn *vpn;
vpn = (struct bgpevpn *)backet->data;
if (!vpn) {
zlog_warn("%s: VNI hash entry for VNI not found", __FUNCTION__);
return;
}
/* Skip VNIs with configured RD. */
if (is_rd_configured(vpn))
return;
bgp_evpn_derive_auto_rd(bgp, vpn);
update_advertise_vni_routes(bgp, vpn);
}
/*
* Handle router-id change. Delete and withdraw local routes corresponding
* to this VNI from peers. Note that this is invoked prior to updating
* the router-id and is done only on the global route table, the routes
* are needed in the per-VNI table to re-advertise with new router id.
*/
static void withdraw_router_id_vni(struct hash_backet *backet, struct bgp *bgp)
{
struct bgpevpn *vpn;
vpn = (struct bgpevpn *)backet->data;
if (!vpn) {
zlog_warn("%s: VNI hash entry for VNI not found", __FUNCTION__);
return;
}
/* Skip VNIs with configured RD. */
if (is_rd_configured(vpn))
return;
delete_withdraw_vni_routes(bgp, vpn);
}
/*
* Process received EVPN type-2 route (advertise or withdraw).
*/
static int process_type2_route(struct peer *peer, afi_t afi, safi_t safi,
struct attr *attr, u_char *pfx, int psize,
u_int32_t addpath_id)
{
struct prefix_rd prd;
struct prefix_evpn p;
u_char ipaddr_len;
u_char macaddr_len;
mpls_label_t *label_pnt;
int ret;
/* Type-2 route should be either 33, 37 or 49 bytes or an
* additional 3 bytes if there is a second label (VNI):
* RD (8), ESI (10), Eth Tag (4), MAC Addr Len (1),
* MAC Addr (6), IP len (1), IP (0, 4 or 16),
* MPLS Lbl1 (3), MPLS Lbl2 (0 or 3)
*/
if (psize != 33 && psize != 37 && psize != 49 && psize != 36
&& psize != 40 && psize != 52) {
zlog_err("%u:%s - Rx EVPN Type-2 NLRI with invalid length %d",
peer->bgp->vrf_id, peer->host, psize);
return -1;
}
/* Make prefix_rd */
prd.family = AF_UNSPEC;
prd.prefixlen = 64;
memcpy(&prd.val, pfx, 8);
pfx += 8;
/* Make EVPN prefix. */
memset(&p, 0, sizeof(struct prefix_evpn));
p.family = AF_EVPN;
p.prefixlen = EVPN_TYPE_2_ROUTE_PREFIXLEN;
p.prefix.route_type = BGP_EVPN_MAC_IP_ROUTE;
/* Skip over Ethernet Seg Identifier for now. */
pfx += 10;
/* Skip over Ethernet Tag for now. */
pfx += 4;
/* Get the MAC Addr len */
macaddr_len = *pfx++;
/* Get the MAC Addr */
if (macaddr_len == (ETH_ALEN * 8)) {
memcpy(&p.prefix.mac.octet, pfx, ETH_ALEN);
pfx += ETH_ALEN;
} else {
zlog_err(
"%u:%s - Rx EVPN Type-2 NLRI with unsupported MAC address length %d",
peer->bgp->vrf_id, peer->host, macaddr_len);
return -1;
}
/* Get the IP. */
ipaddr_len = *pfx++;
if (ipaddr_len != 0 && ipaddr_len != IPV4_MAX_BITLEN
&& ipaddr_len != IPV6_MAX_BITLEN) {
zlog_err(
"%u:%s - Rx EVPN Type-2 NLRI with unsupported IP address length %d",
peer->bgp->vrf_id, peer->host, ipaddr_len);
return -1;
}
if (ipaddr_len) {
ipaddr_len /= 8; /* Convert to bytes. */
p.prefix.ip.ipa_type = (ipaddr_len == IPV4_MAX_BYTELEN)
? IPADDR_V4
: IPADDR_V6;
memcpy(&p.prefix.ip.ip.addr, pfx, ipaddr_len);
}
pfx += ipaddr_len;
/* Get the VNI (in MPLS label field). */
/* Note: We ignore the second VNI, if any. */
label_pnt = (mpls_label_t *)pfx;
/* Process the route. */
if (attr)
ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, label_pnt, 0, NULL);
else
ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, label_pnt, NULL);
return ret;
}
/*
* Process received EVPN type-3 route (advertise or withdraw).
*/
static int process_type3_route(struct peer *peer, afi_t afi, safi_t safi,
struct attr *attr, u_char *pfx, int psize,
u_int32_t addpath_id)
{
struct prefix_rd prd;
struct prefix_evpn p;
u_char ipaddr_len;
int ret;
/* Type-3 route should be either 17 or 29 bytes: RD (8), Eth Tag (4),
* IP len (1) and IP (4 or 16).
*/
if (psize != 17 && psize != 29) {
zlog_err("%u:%s - Rx EVPN Type-3 NLRI with invalid length %d",
peer->bgp->vrf_id, peer->host, psize);
return -1;
}
/* Make prefix_rd */
prd.family = AF_UNSPEC;
prd.prefixlen = 64;
memcpy(&prd.val, pfx, 8);
pfx += 8;
/* Make EVPN prefix. */
memset(&p, 0, sizeof(struct prefix_evpn));
p.family = AF_EVPN;
p.prefixlen = EVPN_TYPE_3_ROUTE_PREFIXLEN;
p.prefix.route_type = BGP_EVPN_IMET_ROUTE;
/* Skip over Ethernet Tag for now. */
pfx += 4;
/* Get the IP. */
ipaddr_len = *pfx++;
if (ipaddr_len == IPV4_MAX_BITLEN) {
p.prefix.ip.ipa_type = IPADDR_V4;
memcpy(&p.prefix.ip.ip.addr, pfx, IPV4_MAX_BYTELEN);
} else {
zlog_err(
"%u:%s - Rx EVPN Type-3 NLRI with unsupported IP address length %d",
peer->bgp->vrf_id, peer->host, ipaddr_len);
return -1;
}
/* Process the route. */
if (attr)
ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, NULL, 0, NULL);
else
ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, NULL, NULL);
return ret;
}
/*
* Process received EVPN type-5 route (advertise or withdraw).
*/
static int process_type5_route(struct peer *peer, afi_t afi, safi_t safi,
struct attr *attr, u_char *pfx, int psize,
u_int32_t addpath_id, int withdraw)
{
struct prefix_rd prd;
struct prefix_evpn p;
struct bgp_route_evpn evpn;
u_char ippfx_len;
u_int32_t eth_tag;
mpls_label_t *label_pnt;
int ret;
/* Type-5 route should be 34 or 58 bytes:
* RD (8), ESI (10), Eth Tag (4), IP len (1), IP (4 or 16),
* GW (4 or 16) and VNI (3).
* Note that the IP and GW should both be IPv4 or both IPv6.
*/
if (psize != 34 && psize != 58) {
zlog_err("%u:%s - Rx EVPN Type-5 NLRI with invalid length %d",
peer->bgp->vrf_id, peer->host, psize);
return -1;
}
/* Make prefix_rd */
prd.family = AF_UNSPEC;
prd.prefixlen = 64;
memcpy(&prd.val, pfx, 8);
pfx += 8;
/* Make EVPN prefix. */
memset(&p, 0, sizeof(struct prefix_evpn));
p.family = AF_EVPN;
p.prefix.route_type = BGP_EVPN_IP_PREFIX_ROUTE;
/* Additional information outside of prefix - ESI and GW IP */
memset(&evpn, 0, sizeof(evpn));
/* Fetch ESI */
memcpy(&evpn.eth_s_id.val, pfx, 10);
pfx += 10;
/* Fetch Ethernet Tag. */
memcpy(&eth_tag, pfx, 4);
p.prefix.eth_tag = ntohl(eth_tag);
pfx += 4;
/* Fetch IP prefix length. */
ippfx_len = *pfx++;
if (ippfx_len > IPV6_MAX_BITLEN) {
zlog_err(
"%u:%s - Rx EVPN Type-5 NLRI with invalid IP Prefix length %d",
peer->bgp->vrf_id, peer->host, ippfx_len);
return -1;
}
p.prefix.ip_prefix_length = ippfx_len;
/* Determine IPv4 or IPv6 prefix */
/* Since the address and GW are from the same family, this just becomes
* a simple check on the total size.
*/
if (psize == 34) {
SET_IPADDR_V4(&p.prefix.ip);
memcpy(&p.prefix.ip.ipaddr_v4, pfx, 4);
pfx += 4;
memcpy(&evpn.gw_ip.ipv4, pfx, 4);
pfx += 4;
p.prefixlen = PREFIX_LEN_ROUTE_TYPE_5_IPV4;
} else {
SET_IPADDR_V6(&p.prefix.ip);
memcpy(&p.prefix.ip.ipaddr_v6, pfx, 16);
pfx += 16;
memcpy(&evpn.gw_ip.ipv6, pfx, 16);
pfx += 16;
p.prefixlen = PREFIX_LEN_ROUTE_TYPE_5_IPV6;
}
label_pnt = (mpls_label_t *)pfx;
/* Process the route. */
if (!withdraw)
ret = bgp_update(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, label_pnt, 0, &evpn);
else
ret = bgp_withdraw(peer, (struct prefix *)&p, addpath_id, attr,
afi, safi, ZEBRA_ROUTE_BGP, BGP_ROUTE_NORMAL,
&prd, label_pnt, &evpn);
return ret;
}
static void evpn_mpattr_encode_type5(struct stream *s, struct prefix *p,
struct prefix_rd *prd, mpls_label_t *label,
struct attr *attr)
{
int len;
char temp[16];
struct evpn_addr *p_evpn_p;
memset(&temp, 0, 16);
if (p->family != AF_EVPN)
return;
p_evpn_p = &(p->u.prefix_evpn);
if (IS_IPADDR_V4(&p_evpn_p->ip))
len = 8; /* ipv4 */
else
len = 32; /* ipv6 */
stream_putc(s, BGP_EVPN_IP_PREFIX_ROUTE);
/* Prefix contains RD, ESI, EthTag, IP length, IP, GWIP and VNI */
stream_putc(s, 8 + 10 + 4 + 1 + len + 3);
stream_put(s, prd->val, 8);
if (attr)
stream_put(s, &(attr->evpn_overlay.eth_s_id), 10);
else
stream_put(s, &temp, 10);
stream_putl(s, p_evpn_p->eth_tag);
stream_putc(s, p_evpn_p->ip_prefix_length);
if (IS_IPADDR_V4(&p_evpn_p->ip))
stream_put_ipv4(s, p_evpn_p->ip.ipaddr_v4.s_addr);
else
stream_put(s, &p_evpn_p->ip.ipaddr_v6, 16);
if (attr) {
if (IS_IPADDR_V4(&p_evpn_p->ip))
stream_put_ipv4(s,
attr->evpn_overlay.gw_ip.ipv4.s_addr);
else
stream_put(s, &(attr->evpn_overlay.gw_ip.ipv6), 16);
} else {
if (IS_IPADDR_V4(&p_evpn_p->ip))
stream_put_ipv4(s, 0);
else
stream_put(s, &temp, 16);
}
if (label)
stream_put(s, label, 3);
else
stream_put3(s, 0);
}
/*
* Cleanup specific VNI upon EVPN (advertise-all-vni) being disabled.
*/
static void cleanup_vni_on_disable(struct hash_backet *backet, struct bgp *bgp)
{
struct bgpevpn *vpn = (struct bgpevpn *)backet->data;
/* Remove EVPN routes and schedule for processing. */
delete_routes_for_vni(bgp, vpn);
/* Clear "live" flag and see if hash needs to be freed. */
UNSET_FLAG(vpn->flags, VNI_FLAG_LIVE);
if (!is_vni_configured(vpn))
bgp_evpn_free(bgp, vpn);
}
/*
* Free a VNI entry; iterator function called during cleanup.
*/
static void free_vni_entry(struct hash_backet *backet, struct bgp *bgp)
{
struct bgpevpn *vpn;
vpn = (struct bgpevpn *)backet->data;
delete_all_vni_routes(bgp, vpn);
bgp_evpn_free(bgp, vpn);
}
/*
* Public functions.
*/
/*
* Handle change to BGP router id. This is invoked twice by the change
* handler, first before the router id has been changed and then after
* the router id has been changed. The first invocation will result in
* local routes for all VNIs being deleted and withdrawn and the next
* will result in the routes being re-advertised.
*/
void bgp_evpn_handle_router_id_update(struct bgp *bgp, int withdraw)
{
if (withdraw)
hash_iterate(bgp->vnihash,
(void (*)(struct hash_backet *,
void *))withdraw_router_id_vni,
bgp);
else
hash_iterate(bgp->vnihash,
(void (*)(struct hash_backet *,
void *))update_router_id_vni,
bgp);
}
/*
* Handle change to export RT - update and advertise local routes.
*/
int bgp_evpn_handle_export_rt_change(struct bgp *bgp, struct bgpevpn *vpn)
{
return update_routes_for_vni(bgp, vpn);
}
/*
* Handle change to RD. This is invoked twice by the change handler,
* first before the RD has been changed and then after the RD has
* been changed. The first invocation will result in local routes
* of this VNI being deleted and withdrawn and the next will result
* in the routes being re-advertised.
*/
void bgp_evpn_handle_rd_change(struct bgp *bgp, struct bgpevpn *vpn,
int withdraw)
{
if (withdraw)
delete_withdraw_vni_routes(bgp, vpn);
else
update_advertise_vni_routes(bgp, vpn);
}
/*
* Install routes for this VNI. Invoked upon change to Import RT.
*/
int bgp_evpn_install_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
return install_routes_for_vni(bgp, vpn);
}
/*
* Uninstall all routes installed for this VNI. Invoked upon change
* to Import RT.
*/
int bgp_evpn_uninstall_routes(struct bgp *bgp, struct bgpevpn *vpn)
{
return uninstall_routes_for_vni(bgp, vpn);
}
/*
* Function to display "tag" in route as a VNI.
*/
char *bgp_evpn_label2str(mpls_label_t *label, char *buf, int len)
{
vni_t vni;
vni = label2vni(label);
snprintf(buf, len, "%u", vni);
return buf;
}
/*
* Function to convert evpn route to json format.
* NOTE: We don't use prefix2str as the output here is a bit different.
*/
void bgp_evpn_route2json(struct prefix_evpn *p, json_object *json)
{
char buf1[ETHER_ADDR_STRLEN];
char buf2[PREFIX2STR_BUFFER];
if (!json)
return;
if (p->prefix.route_type == BGP_EVPN_IMET_ROUTE) {
json_object_int_add(json, "routeType", p->prefix.route_type);
json_object_int_add(json, "ethTag", 0);
json_object_int_add(json, "ipLen",
IS_EVPN_PREFIX_IPADDR_V4(p)
? IPV4_MAX_BITLEN
: IPV6_MAX_BITLEN);
json_object_string_add(json, "ip",
inet_ntoa(p->prefix.ip.ipaddr_v4));
} else if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
if (IS_EVPN_PREFIX_IPADDR_NONE(p)) {
json_object_int_add(json, "routeType",
p->prefix.route_type);
json_object_int_add(
json, "esi",
0); /* TODO: we don't support esi yet */
json_object_int_add(json, "ethTag", 0);
json_object_int_add(json, "macLen", 8 * ETH_ALEN);
json_object_string_add(json, "mac",
prefix_mac2str(&p->prefix.mac,
buf1,
sizeof(buf1)));
} else {
u_char family;
family = IS_EVPN_PREFIX_IPADDR_V4(p) ? AF_INET
: AF_INET6;
json_object_int_add(json, "routeType",
p->prefix.route_type);
json_object_int_add(
json, "esi",
0); /* TODO: we don't support esi yet */
json_object_int_add(json, "ethTag", 0);
json_object_int_add(json, "macLen", 8 * ETH_ALEN);
json_object_string_add(json, "mac",
prefix_mac2str(&p->prefix.mac,
buf1,
sizeof(buf1)));
json_object_int_add(json, "ipLen",
IS_EVPN_PREFIX_IPADDR_V4(p)
? IPV4_MAX_BITLEN
: IPV6_MAX_BITLEN);
json_object_string_add(
json, "ip",
inet_ntop(family, &p->prefix.ip.ip.addr, buf2,
PREFIX2STR_BUFFER));
}
} else {
/* Currently, this is to cater to other AF_ETHERNET code. */
}
}
/*
* Function to convert evpn route to string.
* NOTE: We don't use prefix2str as the output here is a bit different.
*/
char *bgp_evpn_route2str(struct prefix_evpn *p, char *buf, int len)
{
char buf1[ETHER_ADDR_STRLEN];
char buf2[PREFIX2STR_BUFFER];
if (p->prefix.route_type == BGP_EVPN_IMET_ROUTE) {
snprintf(buf, len, "[%d]:[0]:[%d]:[%s]", p->prefix.route_type,
IS_EVPN_PREFIX_IPADDR_V4(p) ? IPV4_MAX_BITLEN
: IPV6_MAX_BITLEN,
inet_ntoa(p->prefix.ip.ipaddr_v4));
} else if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
if (IS_EVPN_PREFIX_IPADDR_NONE(p))
snprintf(buf, len, "[%d]:[0]:[0]:[%d]:[%s]",
p->prefix.route_type, 8 * ETH_ALEN,
prefix_mac2str(&p->prefix.mac, buf1,
sizeof(buf1)));
else {
u_char family;
family = IS_EVPN_PREFIX_IPADDR_V4(p) ? AF_INET
: AF_INET6;
snprintf(buf, len, "[%d]:[0]:[0]:[%d]:[%s]:[%d]:[%s]",
p->prefix.route_type, 8 * ETH_ALEN,
prefix_mac2str(&p->prefix.mac, buf1,
sizeof(buf1)),
family == AF_INET ? IPV4_MAX_BITLEN
: IPV6_MAX_BITLEN,
inet_ntop(family, &p->prefix.ip.ip.addr, buf2,
PREFIX2STR_BUFFER));
}
} else {
/* For EVPN route types not supported yet. */
}
return (buf);
}
/*
* Encode EVPN prefix in Update (MP_REACH)
*/
void bgp_evpn_encode_prefix(struct stream *s, struct prefix *p,
struct prefix_rd *prd, mpls_label_t *label,
struct attr *attr, int addpath_encode,
u_int32_t addpath_tx_id)
{
struct prefix_evpn *evp = (struct prefix_evpn *)p;
int ipa_len = 0;
if (addpath_encode)
stream_putl(s, addpath_tx_id);
/* Route type */
stream_putc(s, evp->prefix.route_type);
switch (evp->prefix.route_type) {
case BGP_EVPN_MAC_IP_ROUTE:
if (IS_EVPN_PREFIX_IPADDR_V4(evp))
ipa_len = IPV4_MAX_BYTELEN;
else if (IS_EVPN_PREFIX_IPADDR_V6(evp))
ipa_len = IPV6_MAX_BYTELEN;
stream_putc(s, 33 + ipa_len); // 1 VNI
stream_put(s, prd->val, 8); /* RD */
stream_put(s, 0, 10); /* ESI */
stream_putl(s, 0); /* Ethernet Tag ID */
stream_putc(s, 8 * ETH_ALEN); /* Mac Addr Len - bits */
stream_put(s, evp->prefix.mac.octet, 6); /* Mac Addr */
stream_putc(s, 8 * ipa_len); /* IP address Length */
if (ipa_len)
stream_put(s, &evp->prefix.ip.ip.addr,
ipa_len); /* IP */
stream_put(s, label,
BGP_LABEL_BYTES); /* VNI is contained in 'tag' */
break;
case BGP_EVPN_IMET_ROUTE:
stream_putc(s, 17); // TODO: length - assumes IPv4 address
stream_put(s, prd->val, 8); /* RD */
stream_putl(s, 0); /* Ethernet Tag ID */
stream_putc(s, IPV4_MAX_BITLEN); /* IP address Length - bits */
/* Originating Router's IP Addr */
stream_put_in_addr(s, &evp->prefix.ip.ipaddr_v4);
break;
case BGP_EVPN_IP_PREFIX_ROUTE:
/* TODO: AddPath support. */
evpn_mpattr_encode_type5(s, p, prd, label, attr);
break;
default:
break;
}
}
int bgp_nlri_parse_evpn(struct peer *peer, struct attr *attr,
struct bgp_nlri *packet, int withdraw)
{
u_char *pnt;
u_char *lim;
afi_t afi;
safi_t safi;
u_int32_t addpath_id;
int addpath_encoded;
int psize = 0;
u_char rtype;
u_char rlen;
struct prefix p;
/* Check peer status. */
if (peer->status != Established) {
zlog_err("%u:%s - EVPN update received in state %d",
peer->bgp->vrf_id, peer->host, peer->status);
return -1;
}
/* Start processing the NLRI - there may be multiple in the MP_REACH */
pnt = packet->nlri;
lim = pnt + packet->length;
afi = packet->afi;
safi = packet->safi;
addpath_id = 0;
addpath_encoded =
(CHECK_FLAG(peer->af_cap[afi][safi], PEER_CAP_ADDPATH_AF_RX_ADV)
&& CHECK_FLAG(peer->af_cap[afi][safi],
PEER_CAP_ADDPATH_AF_TX_RCV));
for (; pnt < lim; pnt += psize) {
/* Clear prefix structure. */
memset(&p, 0, sizeof(struct prefix));
/* Deal with path-id if AddPath is supported. */
if (addpath_encoded) {
/* When packet overflow occurs return immediately. */
if (pnt + BGP_ADDPATH_ID_LEN > lim)
return -1;
addpath_id = ntohl(*((uint32_t *)pnt));
pnt += BGP_ADDPATH_ID_LEN;
}
/* All EVPN NLRI types start with type and length. */
if (pnt + 2 > lim)
return -1;
rtype = *pnt++;
psize = rlen = *pnt++;
/* When packet overflow occur return immediately. */
if (pnt + psize > lim)
return -1;
switch (rtype) {
case BGP_EVPN_MAC_IP_ROUTE:
if (process_type2_route(peer, afi, safi,
withdraw ? NULL : attr, pnt,
psize, addpath_id)) {
zlog_err(
"%u:%s - Error in processing EVPN type-2 NLRI size %d",
peer->bgp->vrf_id, peer->host, psize);
return -1;
}
break;
case BGP_EVPN_IMET_ROUTE:
if (process_type3_route(peer, afi, safi,
withdraw ? NULL : attr, pnt,
psize, addpath_id)) {
zlog_err(
"%u:%s - Error in processing EVPN type-3 NLRI size %d",
peer->bgp->vrf_id, peer->host, psize);
return -1;
}
break;
case BGP_EVPN_IP_PREFIX_ROUTE:
if (process_type5_route(peer, afi, safi, attr, pnt,
psize, addpath_id, withdraw)) {
zlog_err(
"%u:%s - Error in processing EVPN type-5 NLRI size %d",
peer->bgp->vrf_id, peer->host, psize);
return -1;
}
break;
default:
break;
}
}
/* Packet length consistency check. */
if (pnt != lim)
return -1;
return 0;
}
/*
* Map the RTs (configured or automatically derived) of a VNI to the VNI.
* The mapping will be used during route processing.
*/
void bgp_evpn_map_vni_to_its_rts(struct bgp *bgp, struct bgpevpn *vpn)
{
int i;
struct ecommunity_val *eval;
struct listnode *node, *nnode;
struct ecommunity *ecom;
for (ALL_LIST_ELEMENTS(vpn->import_rtl, node, nnode, ecom)) {
for (i = 0; i < ecom->size; i++) {
eval = (struct ecommunity_val *)(ecom->val
+ (i
* ECOMMUNITY_SIZE));
map_vni_to_rt(bgp, vpn, eval);
}
}
}
/*
* Unmap the RTs (configured or automatically derived) of a VNI from the VNI.
*/
void bgp_evpn_unmap_vni_from_its_rts(struct bgp *bgp, struct bgpevpn *vpn)
{
int i;
struct ecommunity_val *eval;
struct listnode *node, *nnode;
struct ecommunity *ecom;
for (ALL_LIST_ELEMENTS(vpn->import_rtl, node, nnode, ecom)) {
for (i = 0; i < ecom->size; i++) {
struct irt_node *irt;
struct ecommunity_val eval_tmp;
eval = (struct ecommunity_val *)(ecom->val
+ (i
* ECOMMUNITY_SIZE));
/* If using "automatic" RT, we only care about the
* local-admin sub-field.
* This is to facilitate using VNI as the RT for EBGP
* peering too.
*/
memcpy(&eval_tmp, eval, ECOMMUNITY_SIZE);
if (!is_import_rt_configured(vpn))
mask_ecom_global_admin(&eval_tmp, eval);
irt = lookup_import_rt(bgp, &eval_tmp);
if (irt)
unmap_vni_from_rt(bgp, vpn, irt);
}
}
}
/*
* Derive Import RT automatically for VNI and map VNI to RT.
* The mapping will be used during route processing.
*/
void bgp_evpn_derive_auto_rt_import(struct bgp *bgp, struct bgpevpn *vpn)
{
form_auto_rt(bgp, vpn, vpn->import_rtl);
UNSET_FLAG(vpn->flags, VNI_FLAG_IMPRT_CFGD);
/* Map RT to VNI */
bgp_evpn_map_vni_to_its_rts(bgp, vpn);
}
/*
* Derive Export RT automatically for VNI.
*/
void bgp_evpn_derive_auto_rt_export(struct bgp *bgp, struct bgpevpn *vpn)
{
form_auto_rt(bgp, vpn, vpn->export_rtl);
UNSET_FLAG(vpn->flags, VNI_FLAG_EXPRT_CFGD);
}
/*
* Derive RD automatically for VNI using passed information - it
* is of the form RouterId:unique-id-for-vni.
*/
void bgp_evpn_derive_auto_rd(struct bgp *bgp, struct bgpevpn *vpn)
{
char buf[100];
vpn->prd.family = AF_UNSPEC;
vpn->prd.prefixlen = 64;
sprintf(buf, "%s:%hu", inet_ntoa(bgp->router_id), vpn->rd_id);
str2prefix_rd(buf, &vpn->prd);
UNSET_FLAG(vpn->flags, VNI_FLAG_RD_CFGD);
}
/*
* Lookup VNI.
*/
struct bgpevpn *bgp_evpn_lookup_vni(struct bgp *bgp, vni_t vni)
{
struct bgpevpn *vpn;
struct bgpevpn tmp;
memset(&tmp, 0, sizeof(struct bgpevpn));
tmp.vni = vni;
vpn = hash_lookup(bgp->vnihash, &tmp);
return vpn;
}
/*
* Create a new vpn - invoked upon configuration or zebra notification.
*/
struct bgpevpn *bgp_evpn_new(struct bgp *bgp, vni_t vni,
struct in_addr originator_ip)
{
struct bgpevpn *vpn;
if (!bgp)
return NULL;
vpn = XCALLOC(MTYPE_BGP_EVPN, sizeof(struct bgpevpn));
if (!vpn)
return NULL;
/* Set values - RD and RT set to defaults. */
vpn->vni = vni;
vpn->originator_ip = originator_ip;
/* Initialize route-target import and export lists */
vpn->import_rtl = list_new();
vpn->import_rtl->cmp = (int (*)(void *, void *))evpn_route_target_cmp;
vpn->export_rtl = list_new();
vpn->export_rtl->cmp = (int (*)(void *, void *))evpn_route_target_cmp;
bf_assign_index(bgp->rd_idspace, vpn->rd_id);
derive_rd_rt_for_vni(bgp, vpn);
/* Initialize EVPN route table. */
vpn->route_table = bgp_table_init(AFI_L2VPN, SAFI_EVPN);
/* Add to hash */
if (!hash_get(bgp->vnihash, vpn, hash_alloc_intern)) {
XFREE(MTYPE_BGP_EVPN, vpn);
return NULL;
}
QOBJ_REG(vpn, bgpevpn);
return vpn;
}
/*
* Free a given VPN - called in multiple scenarios such as zebra
* notification, configuration being deleted, advertise-all-vni disabled etc.
* This just frees appropriate memory, caller should have taken other
* needed actions.
*/
void bgp_evpn_free(struct bgp *bgp, struct bgpevpn *vpn)
{
bgp_table_unlock(vpn->route_table);
bgp_evpn_unmap_vni_from_its_rts(bgp, vpn);
list_delete(vpn->import_rtl);
list_delete(vpn->export_rtl);
vpn->import_rtl = NULL;
vpn->export_rtl = NULL;
bf_release_index(bgp->rd_idspace, vpn->rd_id);
hash_release(bgp->vnihash, vpn);
QOBJ_UNREG(vpn);
XFREE(MTYPE_BGP_EVPN, vpn);
}
/*
* Import route into matching VNI(s).
*/
int bgp_evpn_import_route(struct bgp *bgp, afi_t afi, safi_t safi,
struct prefix *p, struct bgp_info *ri)
{
return install_uninstall_evpn_route(bgp, afi, safi, p, ri, 1);
}
/*
* Unimport route from matching VNI(s).
*/
int bgp_evpn_unimport_route(struct bgp *bgp, afi_t afi, safi_t safi,
struct prefix *p, struct bgp_info *ri)
{
return install_uninstall_evpn_route(bgp, afi, safi, p, ri, 0);
}
/* filter routes which have martian next hops */
int bgp_filter_evpn_routes_upon_martian_nh_change(struct bgp *bgp)
{
afi_t afi;
safi_t safi;
struct bgp_node *rd_rn, *rn;
struct bgp_table *table;
struct bgp_info *ri;
afi = AFI_L2VPN;
safi = SAFI_EVPN;
/* Walk entire global routing table and evaluate routes which could be
* imported into this VPN. Note that we cannot just look at the routes
* for the VNI's RD -
* remote routes applicable for this VNI could have any RD.
*/
/* EVPN routes are a 2-level table. */
for (rd_rn = bgp_table_top(bgp->rib[afi][safi]); rd_rn;
rd_rn = bgp_route_next(rd_rn)) {
table = (struct bgp_table *)(rd_rn->info);
if (!table)
continue;
for (rn = bgp_table_top(table); rn; rn = bgp_route_next(rn)) {
for (ri = rn->info; ri; ri = ri->next) {
/* Consider "valid" remote routes applicable for
* this VNI. */
if (!(ri->type == ZEBRA_ROUTE_BGP
&& ri->sub_type == BGP_ROUTE_NORMAL))
continue;
if (bgp_nexthop_self(bgp, ri->attr->nexthop)) {
char attr_str[BUFSIZ];
char pbuf[PREFIX_STRLEN];
bgp_dump_attr(ri->attr, attr_str,
BUFSIZ);
if (bgp_debug_update(ri->peer, &rn->p,
NULL, 1))
zlog_debug(
"%u: prefix %s with attr %s - DENIED due to martian or self nexthop",
bgp->vrf_id,
prefix2str(
&rn->p, pbuf,
sizeof(pbuf)),
attr_str);
bgp_evpn_unimport_route(bgp, afi, safi,
&rn->p, ri);
bgp_rib_remove(rn, ri, ri->peer, afi,
safi);
}
}
}
}
return 0;
}
/*
* Handle del of a local MACIP.
*/
int bgp_evpn_local_macip_del(struct bgp *bgp, vni_t vni, struct ethaddr *mac,
struct ipaddr *ip)
{
struct bgpevpn *vpn;
struct prefix_evpn p;
if (!bgp->vnihash) {
zlog_err("%u: VNI hash not created", bgp->vrf_id);
return -1;
}
/* Lookup VNI hash - should exist. */
vpn = bgp_evpn_lookup_vni(bgp, vni);
if (!vpn || !is_vni_live(vpn)) {
zlog_warn("%u: VNI hash entry for VNI %u %s at MACIP DEL",
bgp->vrf_id, vni, vpn ? "not live" : "not found");
return -1;
}
/* Remove EVPN type-2 route and schedule for processing. */
build_evpn_type2_prefix(&p, mac, ip);
delete_evpn_route(bgp, vpn, &p);
return 0;
}
/*
* Handle add of a local MACIP.
*/
int bgp_evpn_local_macip_add(struct bgp *bgp, vni_t vni, struct ethaddr *mac,
struct ipaddr *ip, u_char flags)
{
struct bgpevpn *vpn;
struct prefix_evpn p;
if (!bgp->vnihash) {
zlog_err("%u: VNI hash not created", bgp->vrf_id);
return -1;
}
/* Lookup VNI hash - should exist. */
vpn = bgp_evpn_lookup_vni(bgp, vni);
if (!vpn || !is_vni_live(vpn)) {
zlog_warn("%u: VNI hash entry for VNI %u %s at MACIP ADD",
bgp->vrf_id, vni, vpn ? "not live" : "not found");
return -1;
}
/* Create EVPN type-2 route and schedule for processing. */
build_evpn_type2_prefix(&p, mac, ip);
if (update_evpn_route(bgp, vpn, &p, flags)) {
char buf[ETHER_ADDR_STRLEN];
char buf2[INET6_ADDRSTRLEN];
zlog_err(
"%u:Failed to create Type-2 route, VNI %u %s MAC %s IP %s",
bgp->vrf_id, vpn->vni,
CHECK_FLAG(flags, ZEBRA_MAC_TYPE_STICKY) ? "sticky gateway"
: "",
prefix_mac2str(mac, buf, sizeof(buf)),
ipaddr2str(ip, buf2, sizeof(buf2)));
return -1;
}
return 0;
}
/*
* Handle del of a local VNI.
*/
int bgp_evpn_local_vni_del(struct bgp *bgp, vni_t vni)
{
struct bgpevpn *vpn;
if (!bgp->vnihash) {
zlog_err("%u: VNI hash not created", bgp->vrf_id);
return -1;
}
/* Locate VNI hash */
vpn = bgp_evpn_lookup_vni(bgp, vni);
if (!vpn) {
zlog_warn("%u: VNI hash entry for VNI %u not found at DEL",
bgp->vrf_id, vni);
return 0;
}
/* Remove all local EVPN routes and schedule for processing (to
* withdraw from peers).
*/
delete_routes_for_vni(bgp, vpn);
/*
* tunnel is no longer active, del tunnel ip address from tip_hash
*/
bgp_tip_del(bgp, &vpn->originator_ip);
/* Clear "live" flag and see if hash needs to be freed. */
UNSET_FLAG(vpn->flags, VNI_FLAG_LIVE);
if (!is_vni_configured(vpn))
bgp_evpn_free(bgp, vpn);
return 0;
}
/*
* Handle add (or update) of a local VNI. The only VNI change we care
* about is change to local-tunnel-ip.
*/
int bgp_evpn_local_vni_add(struct bgp *bgp, vni_t vni,
struct in_addr originator_ip)
{
struct bgpevpn *vpn;
struct prefix_evpn p;
if (!bgp->vnihash) {
zlog_err("%u: VNI hash not created", bgp->vrf_id);
return -1;
}
/* Lookup VNI. If present and no change, exit. */
vpn = bgp_evpn_lookup_vni(bgp, vni);
if (vpn) {
if (is_vni_live(vpn)
&& IPV4_ADDR_SAME(&vpn->originator_ip, &originator_ip))
/* Probably some other param has changed that we don't
* care about. */
return 0;
/* Local tunnel endpoint IP address has changed */
handle_tunnel_ip_change(bgp, vpn, originator_ip);
}
/* Create or update as appropriate. */
if (!vpn) {
vpn = bgp_evpn_new(bgp, vni, originator_ip);
if (!vpn) {
zlog_err(
"%u: Failed to allocate VNI entry for VNI %u - at Add",
bgp->vrf_id, vni);
return -1;
}
}
/* if the VNI is live already, there is nothing more to do */
if (is_vni_live(vpn))
return 0;
/* Mark as "live" */
SET_FLAG(vpn->flags, VNI_FLAG_LIVE);
/* tunnel is now active, add tunnel-ip to db */
bgp_tip_add(bgp, &originator_ip);
/* filter routes as nexthop database has changed */
bgp_filter_evpn_routes_upon_martian_nh_change(bgp);
/* Create EVPN type-3 route and schedule for processing. */
build_evpn_type3_prefix(&p, vpn->originator_ip);
if (update_evpn_route(bgp, vpn, &p, 0)) {
zlog_err("%u: Type3 route creation failure for VNI %u",
bgp->vrf_id, vni);
return -1;
}
/* If we have learnt and retained remote routes (VTEPs, MACs) for this
* VNI,
* install them.
*/
install_routes_for_vni(bgp, vpn);
/* If we are advertising gateway mac-ip
It needs to be conveyed again to zebra */
bgp_zebra_advertise_gw_macip(bgp, vpn->advertise_gw_macip, vpn->vni);
return 0;
}
/*
* Cleanup EVPN information on disable - Need to delete and withdraw
* EVPN routes from peers.
*/
void bgp_evpn_cleanup_on_disable(struct bgp *bgp)
{
hash_iterate(bgp->vnihash, (void (*)(struct hash_backet *,
void *))cleanup_vni_on_disable,
bgp);
}
/*
* Cleanup EVPN information - invoked at the time of bgpd exit or when the
* BGP instance (default) is being freed.
*/
void bgp_evpn_cleanup(struct bgp *bgp)
{
if (bgp->vnihash)
hash_iterate(bgp->vnihash, (void (*)(struct hash_backet *,
void *))free_vni_entry,
bgp);
if (bgp->import_rt_hash)
hash_free(bgp->import_rt_hash);
bgp->import_rt_hash = NULL;
if (bgp->vnihash)
hash_free(bgp->vnihash);
bgp->vnihash = NULL;
bf_free(bgp->rd_idspace);
}
/*
* Initialization for EVPN
* Create
* VNI hash table
* hash for RT to VNI
* unique rd id space for auto derivation of RD for VNIs
*/
void bgp_evpn_init(struct bgp *bgp)
{
bgp->vnihash =
hash_create(vni_hash_key_make, vni_hash_cmp, "BGP VNI Hash");
bgp->import_rt_hash =
hash_create(import_rt_hash_key_make, import_rt_hash_cmp,
"BGP Import RT Hash");
bf_init(bgp->rd_idspace, UINT16_MAX);
/*assign 0th index in the bitfield, so that we start with id 1*/
bf_assign_zero_index(bgp->rd_idspace);
}
Reference in New Issue View Git Blame Copy Permalink